Words that start with 'ad' and contain 'a'

What's the highest number of points you can get in Scrabble from this list of words that start with 'ad' and contain 'a'?
As there are so many words to select from, we'd advise going for 'adazzle' which scores 26 points.

Which word in particular from this list has the largest letter count?
The word 'adenylpyrophosphate' has 19 characters.

How many words are there using the combination of letters requested?
Altogether, you can make 620 words.

Is there an example word from this page which might be thought of as unique?
Standing as our favorite unusual word on this page is 'adoptable'. The dictionary defines it as "Capable of being adopted.".

Is there any word on this page that stands out as the most common?
The most well-known word for the combination you requested is 'additional'.